I recently installed Google Plugin for eclipse. While troubleshooting something I couldn't find in the menu, I clicked on "Reset Perspective". Now I no longer see Wireframesketcher under Open Perspective/Other. Also all the screen files I created before now open up as xml files. Please help. Thanks.
It looks like WireframeSketcher plugin is not installed or perhaps is disabled. Try to reinstall it and see if it fixes the problem. Let me know if it worked for you.
mzm02 Feb 2013
Re-installing Wireframesketcher worked; although I had to try a few times (uninstall/install and revert installation history etc.) I suspect the new plug-ins I installed might have messed it up.